↑ 1.01.1Fernando Orphão de Carvalho, Gean Nunes Damulakis, The Structure of Akroá and Xakriabá and their relation to Xavante and Xerente: A contribution to the historical linguistics of the Jê languages (2015), citing for the older forms Martius, Beiträge zur Ethnographie und Sprachenkunde Brasiliens (1867; citing Pohl) and Ehrenreich (1895)